System of signaling.



(No Model.)

A. J. mufln'v. SYSTEM 0F SlGNALING.

(Application fild Apr. 5, 1901.)

Patented Oct. 15,1901.

Nrri: TATES ARTHUR J. MUNDY, OF BGSTON, MASSACHUSETTS, ASSIGNQR TO GRAYTELEPHONE OOliiPANY, OF WATERVILLE, MAINE, AND BOSTON, MAS- SACHUSETTS,A CORPORATION OF MAINE.

SYSTEM OF SlGNALiNG,

SPECIFICATION forming part of Letters-Patent No. 684,706, dated Qctober15, 1901.-

' Application filed April 5, 1901. Serial No. 54,419. (No model) To all}whom, it may concern:

Be it known that I, ARTHUR J. MUNDY, a citizen of the United States,residing at Boston, in the county of Sufiolk and State of Massachusetts,have invented a new and useful Improvement in Systems of Signaling, ofwhich the following is a full, clear, and exact description, referencebeing bad tothe ac I companying drawing, forming a part of this respecification, in explaining its nature.

The invention relates to an improvement in the system or art ofsignaling, which combines means for sending and receiving instantaneoussignals with means for actuating and receiving progressive or travelingsignals.

For the instantaneous-signaling means I ernploy wireless telegraphyandthe apparatus whichis used for sending and receiving its iinpulsesorsignals. For the progressive signals I employ sound created in air orwater in any desirable way. The sound-signals may be simultaneouslystarted at the moment that the instantaneous signals are used or at apredetermined interval of time before or after such use of theinstantaneous signals. I prefer, however, that they be startedsimultaneously with the instantaneous signals, using in operativeconjunction with the sound-produe ing means a wireless receiver adapted'to be 0 actuated upon receipt of the instantaneous signals to releasethe means for operating the sound-signals.

While I have illustrated my invention a applied to a system whichinvolves the use of 3'5 submarine sound-signals, I do not confine myselftosuch use.

I will illustrate its submarine use as follows: Suppose a ship to beapproaching the coast and it were to be signaled from the shore 40 by mysystem It would receive two signals,

one an instantaneous electric signal from the ordinary wirelesstelegraphy and the other a sound-signal from a submerged hell or othersound -'producing device, and there would thus be delivered to the shipin successive order two signals of essentially different character,preferably simultaneously actuated, one of which reaches. the observerupon the shipinstantly and the other at a known rate of speed. Theobserver'upon the ship by noting the lapse of time between the receiptof the two signals can ascertain the distance of the ship from thecharted location ofthe sound-signal, just as by counting the secondsbetween a flash of lightning and a peal of thunder the distance of thedash is known Two or more sound-signals separated, say, several milescan be used as well as one, and these enable the observer on the ship todetermine his distance from each of them in the manner above described,and with the differ ence in time of their receipt he will be able todetermine the exact position of the ship upon a chart by simply drawingtwo circles thereon, one for each charted location of the twosound-signals, the radius in each case' representing the distanceascertained by the time interval between the wireless electric signaland the receipt of the sound-signals through the water, and the positionor the ship will be where these two circles intersect.

I will now describe my invention more in detail by reference to thedrawing, where l have represented itdiagrammaticallyin a sin gle figure.

A and B are two submerged bells or soundproducing devices havingelectrically-opera'ted striking mechanism.

D is a shoresiation containin g the ordinary wireless-telegraphyapparatus.

C is the ship, having receiving apparatus for wireless telegraphy andthe sound-receiver for hearing the sound impulses from bells A and B.

E and E are stations containing dynamos for operating strikingmechanisms attached to submerged bells A and B and connected with thesame by submarine cables, as shown.

They also contain wireless-telegraphy receiv ers which control thedelivery of the electric currents for actuating the striking mechanismot the bells A and. B. When station D sends out a signal, its action isthreefold.

board the ship C it is also received at stations E and F, closing acircuit at each of these stations, which causes the electromechanismsattached to the submerged bolls A and B to strike simultaneously. Whenthe observer on the ship receives the electric signal from station D, heknows that sound-signals from At the same instant the signal is receivedon A and B have at the same instant started to oral receivers at distantpoints.

travel toward the ship through the water at l the rate of four thousandseven hundred and twelve feet per second. By noting the time intervalbetween he finds that it has taken the sound-signal from A just fourseconds to reach him, while the sound-signal from 11 has in like mannertaken eight seconds to reach him. Thereforeheisfourtimesfourthousandseven hundred and twelve feet from A and eight times four thousand sevenhundred and twelve feet from B. Finding with the pencilcompass theproper measure of thelesser dis tance on his chart, he describes acircle, using point A as a center, and in like manner he draws anothercircle around the point 13, the radius being ascertained by the greaterdistance. Where. these two circles intersect fixes the position of theship. Bells A and B if rung simultaneously declare their identity by adifference in pitch, or if this is not desirable they may be rungsuccessively, in which case theydeclare their identity by ringing givennumbers-as, for instance, bell A a single stroke and bell ll a doublestroke. In addition to the submarine sonnd-signals there may be usedatmospheric sound-Sig nals-such as steam-whistles, sirens, or metaldiaphragms vibrated by magnetic lines of force. G and H indicate suchatmospheric sound-signals. They are also set in action at station D inthe same manner as the sub- ,marine signals and at the same instant, so

that the observer on board ship may also take the time intervals betweenthe instantaneous electric signals and the atmospheric soundsignals anddetermine his position bythe same method as with the submarinesonndsignals, bearing in mind, however, that each second in the watermeans only four thousand seven hundred and twelve feet, while in the airit means eleven hundred feet. When it is desirable to operate E and Findependently, itmay be readily done by well-known devices now used toconfine the iifect of the transmitter at station D to any one of sev-The number of sound-producing stations like E and F that can becontrolled by wireless telegraphy from station D is practicallyunlimited. Thus any number of submarine sound-signaling devices oratmospheric sound-signaling devices, or both, installed along asea-coast many miles in length can all be sounded at the same instant oftime from a single central wireless-telegraphy station D. It is manifestthat this method of signaling is a very desirable one and that it can bepracticed without the employment of expensive cable or other connectionsbetween stations.

Having thus fully lescribed my invention, I claim and desire to seclireby Letters Patent of the United States-- 1. The method or system ofsignallngherein described, the same comprising the transmission of aninstantaneous signal by wireless telegraphy from a'main or sendingstation to two or more signal-operating scarce a receiving-station andthe transmission of a' progressive signal from a sending-station to thesame receiving-station started at the same time or at a known intervalof time with respeet to the time of the instantaneous signal.

2. The method or system ofsignalingherein described, the same comprisingthe transmission of an instantaneous signal by wireless telegraphy froma main or sending station to stations and the transmission of one ormore progressive sig' nals from one or more of said operating-stationsto a receiving-station at the same time or at a known interval of timewith respect to the time of the instantaneous signal.

3. The method or system of sign alinghereln described, the samecomprising the transmis sion of an instantaneous signal by wirelesstelegraphy from a main or sending station to a receiving-station and thetransmission of one or more progressive signals from theirsending-stations to the same receiving-slaw tion, the said progressivesignals being automatically set in action by the instantaneous signal.

4. The method or system of signalingherein described, the samecomprising the transmission of an instantaneous signal by wirelesstelegraph y from a main or sending station to a receiving-station andthe transmission of progressive signals of two rates of progression froma sendjng-station to the same re ceiving-station started at the sametime or at a known interval of time with respect to the time of theinstantaneous signal.

5. The method'or system of signaling from shore to objects at sea orremoved from the shore or vice versa, the same comprising thetransmission of an instantaneous signal by wireless tclegraphy from amain or sending station D to a receiving-station O separated from themain or sending station D by water, H

and the transmission of one or more progressive signals from asending-station D or stations E and F to the same receiving-stationstarted at the same time or at a known interval of time with respect tothe time of the instantaneous signal.

6. The method or system of signaling herein described, the samecomprising the transmission of an instantaneous signal by wirelesstelegraphy from a main or sending station to a receiving-station, whichstations are sepa' rated by water, and the transmission of a progressivesignal from a sending-station through the water to the samereceiving-eta tion started at the same time or at a known interval oftime with respect to the time of the instantaneous signal.

7. The method or system of signaling herein described, the samecomprising the trans nission of an instantaneous signal by wirelesstclegraphy from a main out-mending station to a receiving-stationseparated from it by water, and the transmission of a progressive signalfrom a sendingetation over the water to the same recivin gstsfionstarted it tire same" time or at a. knownintervai of timewith re-.'

spect to the time of the instsntaneoussig'nal;

8. The meets or system of signaling herein telegraphy som main orsending station D to a, receivingrstation O. separated from it by water;and the transmission of one or more progressive; signals from a.sending-station E through'thewater to the same receiving-sta tion O andthe transmission of one ormore progressive signals from asending-station over the water to the same receiving-station, saidprogressive signals being started at the signal is started seine timewith respect to the time of the in- Jstsntaneous signal,

- 9. Themethod or system of signaling herein described, the sameComprisingthe transmission of an'instantaneons signal-by wirelessteiegraphy from a main or sending station to a receiving-station,separated from the main istation by water, and the transmission of aprogressive signal from a sending-station to the same receiving-station,which progressive by the instantaneous signal.

- ARTHURJ. MUNDY. Witnesses;

F. F. RAYMOND, 26,

JOHN E. RLHAYES.

